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摘要: Cura是Ultimaker發(fā)展的一個開源軟件，用于3D打印機印前處理、模型切片和打印輸出的軟件。Cura可以支持中國目前絕大部分的3D打印機。最新的版本采用了PyQT5對界面進行了重構(gòu)，這里介紹從源碼編譯Cura的過程，掌握源碼對于軟件定制和完善打印能力具有重要的意義。
Cura在Linux上的版本總是下載不了，準備自己從源碼進行編譯。
下面是從https://github.com/ultimaker上下載的編譯腳本。原始的腳本有一些問題，自己做了一些修改，如下：

#!/bin/bash
# This is a script which get the latest git repo and build them.
#
# Tested under ubuntu 15.04, lower versions don't have PyQT 5.2.1 which is required by cura
cd ~
if [ ! -d "cura_dev" ]; then
mkdir cura_dev
fi
cd cura_dev
sudo apt-get install -y git cmake cmake-gui autoconf libtool python3-setuptools curl python3-pyqt5.* python3-numpy qml-module-qtquick-controls
git clone https://github.com/Ultimaker/Cura.git
git clone https://github.com/Ultimaker/Uranium.git
git clone https://github.com/Ultimaker/CuraEngine.git
git clone https://github.com/Ultimaker/libArcus
git clone https://github.com/Ultimaker/protobuf.git
cd protobuf
./autogen.sh
./configure
make -j4
sudo make install
sudo ldconfig
cd python
python3 setup.py build
sudo python3 setup.py install
cd ../..
cd libArcus
if [ ! -d "build" ]; then
mkdir build
fi
cd build
cmake .. -DPYTHON_SITE_PACKAGES_DIR=/usr/lib/python3.4/dist-packages
make -j4
sudo make install
cd ../../
cd CuraEngine
if [ ! -d "build" ]; then
mkdir build
fi
cd build
cmake ..
make -j4
cd ../../
cd Uranium
if [ ! -d "build" ]; then
mkdir build
fi
cd build
cmake .. -DPYTHON_SITE_PACKAGES_DIR=/usr/lib/python3.4/dist-packages -DURANIUM_PLUGINS_DIR=/usr/lib/python3.4/dist-packages
sudo make install
cd ../..
cp -rv Uranium/resources/* Cura/resources/
sudo ln -s $PWD/CuraEngine/build/CuraEngine /usr/bin/CuraEngine
cd Cura
python3 cura_app.py
#export PYTHONPATH=/usr/lib/python3/dist-packages

復制代碼

運行了很長時間，但結(jié)果不太妙啊。
編譯結(jié)果出錯：

QWidget: Must construct a QApplication before a QWidget
./ubuntu-15.04-build-script.sh: 行 62: 29168 已放棄 (核心已轉(zhuǎn)儲) python3 cura_app.py

復制代碼

嗯，這可是最新的開發(fā)代碼呀！出點錯是很正常的。
到https://github.com/ultimaker/Cura上去創(chuàng)建了個issue，提交上去，看誰能解決這個問題。
等了兩天，有其他人報同樣的錯誤，但沒有解決辦法。只好自己再進一步研究。
進python控制臺，一步一步運行源碼。發(fā)現(xiàn)主要是缺少UM這個對象，這是Uranium的支持庫，發(fā)現(xiàn)被安裝到了/usr/local/lib/python3/dist-packages里面。
設(shè)置：

export PYTHONPATH=/usr/local/lib/python3/dist-packages

復制代碼

再次運行，出現(xiàn)OpenGL的錯誤，可能是VirtualBox虛擬機的問題。后面再繼續(xù)。
更新所有的庫，可以用這個腳本：

#!/bin/bash
# This is a script which get the latest git repo and build them.
#
# Tested under ubuntu 15.04, lower versions don't have PyQT 5.2.1 which is required by cura
cd ~
cd cura_dev
cd protobuf
git pull
./autogen.sh
./configure
make -j4
sudo make install
sudo ldconfig
cd python
python3 setup.py build
sudo python3 setup.py install
cd ../..
cd libArcus
git pull
cd build
cmake .. -DPYTHON_SITE_PACKAGES_DIR=/usr/lib/python3.4/dist-packages
make -j4
sudo make install
cd ../../
cd CuraEngine
git pull
cd build
cmake ..
make -j4
cd ../../
cd Uranium
git pull
cd build
cmake .. -DPYTHON_SITE_PACKAGES_DIR=/usr/lib/python3.4/dist-packages -DURANIUM_PLUGINS_DIR=/usr/lib/python3.4/dist-packages
sudo make install
cd ../..
cp -rv Uranium/resources/* Cura/resources/
sudo ln -s $PWD/CuraEngine/build/CuraEngine /usr/bin/CuraEngine
cd Cura
python3 cura_app.py